According to a statement from the band, Hill “is addressing a tummy ailment and is following a directive to lay low for the next few weeks.”

The band has postponed a total of 18 dates on its 2017 itinerary, spanning from a show this past Sunday, October 15, in Baltimore through a November 12 concert in New Orleans.

The Texas blues-rock trio is planning to return to the stage for a previously announced December 29 concert at Winstar Casino in Thackerville, Oklahoma. ZZ Top is hoping to reschedule the postponed dates sometime in 2018. In addition, the Rock & Roll Hall of Famers reveal that they’re plotting to “blow it out in 2019 as they celebrate a big ’50’!”